package com.qf.utils;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.pool.DruidDataSourceFactory;
import com.alibaba.druid.pool.DruidPooledConnection;
import com.qf.entity.Book;
import sun.swing.plaf.synth.DefaultSynthStyle;

import javax.sql.DataSource;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Properties;

/*
杨威
2021/9/13
20:46
*/
public class DruidUtil {
    private static DruidDataSource ds;
    private static ThreadLocal<Connection> threadLocal=new ThreadLocal();
    static {
        try {
            Properties properties=new Properties();
            InputStream resourceAsStream = DruidUtil.class.getResourceAsStream("/db.properties");
            System.out.println("resourceAsStream = " + resourceAsStream);
            properties.load(resourceAsStream);
            ds= (DruidDataSource)DruidDataSourceFactory.createDataSource(properties);

        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    public static Connection getConnection(){
        Connection connection = threadLocal.get();
        try {
            if(connection==null){
                connection = ds.getConnection();
                threadLocal.set(connection);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return connection;
    }
    public static void begin(){
        try {
            getConnection().setAutoCommit(false);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    public static void commit(){
        try {
            getConnection().commit();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    public static void rollback(){
        try {
            getConnection().rollback();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    public static void close(){
        try {
            getConnection().close();
            threadLocal.remove();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}
